It was at idle. I also noticed the 3.3v at 3.4v but that didn't alarm me as much as the 12.4v. Since it is in the ASUS 890 rig that I'm troubleshooting with Nate's 965 I didn't want to leave it in for long so I swapped my ELT500 back in (its' volts are 3.36v, 5.10v, and 12.01v respectively). I guess I should have tested under load for a few minutes?

I have come to the conclusion that "FaceBook" should be renamed "FacePalm"

Those voltages are completely normal. It's meant to be a bit higher so when load is applied it has enough "oomph" to not drop below 12V. Even your 12V car battery can be as high as 14.4V, though i'd be strongly concerned if the PSU was that high. No worries. Your voltages are acceptable